KVM

DESCRIPTION

Install KVM Hypervisor on Ubuntu, Debian, CentOS or RHEL

REQUIREMENTS

OS

• Ubuntu (tested)
• Debian
• CentOS (tested host)
• RHEL

Cookbooks

• sysctl: https://github.com/Youscribe/sysctl-cookbook
• modules: https://github.com/Youscribe/modules-cookbook
• sysfs: https://github.com/Youscribe/sysfs-cookbook
• cpu: https://github.com/Youscribe/cpu-cookbook

USAGE

Default recipe

Detect the server role from OHAI : host or guest. And install minimum packages.
For security, the default recipe doesn't install a kvm server, you need to install it with kvm::host

host recipe

Install minimum packages and configuration to do kvm virtualization.

guest recipe

Install minimum packages and configuration for a kvm guest.

host-tuning recipe

Install packages and configuration to enhance your kvm host.

• Set vm.swappiness = 0 if the kernel < 3.5 and cpu has ept flag.
• Load vhost_net module on Ubuntu/debian to speed up networking.
• Avoid cpu frequency change to prevent potential clock drifting.
• Enable transparent huge pages

guest-tuning recipe

Install packages and configuration to enhance your kvm guest.

• Change the block IO scheduler according to the attribute default["kvm"]["guest"]["tuning"]["io_scheduler"]. By the default the noop scheduler is used.